Defection of Viktor Belenko

On September 6, 1976, Lieutenant Viktor Belenko of the Soviet Air Defense Forces defected by flying his Mikoyan-Gurevich MiG-25P "Foxbat" aircraft from near Vladivostok in the Far East of the Soviet Union to Hakodate Airport in Hokkaido Prefecture of Japan. Belenko's defection caused tension between Japan and the Soviet Union, especially after Japanese and American specialists disassembled and examined the aircraft.

Source: Wikipedia — Defection of Viktor Belenko (CC BY-SA 4.0)